Question

The time in which a force of 2 N produces a change of momentum of $0.4kg - ms^{- 1}$ in the body is

• A. 0.2 s
• B. 0.02 s
• C. 0.5 s
• D. 0.05 s

Answer 1

Answer: (A)

0.2 s

Answer 2

$\overrightarrow{F} = \frac{\Delta\overrightarrow{p}}{\Delta t} \Rightarrow \Delta t = \frac{|\Delta\overrightarrow{p}|}{|\overrightarrow{F}|} = \frac{0.4}{2} = 0.2\mspace{6mu} s$